<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title></title>
		<style type="text/css">
			span{
				counter-reset: la;
			}
			span:before{
				content: counter(la,lower-roman);
				counter-increment: la 2;
				
			}
		</style>
	</head>
	<body>
		<div>我是世界上第<span></span>的人</div>
	</body>
</html>
